[dm-crypt] RHEL6 crypto support

Arno Wagner arno at wagner.name
Fri Jan 18 20:33:32 CET 2013


On Fri, Jan 18, 2013 at 11:16:42AM -0800, David Li wrote:
> Here is a newbie question.
> 
> I encountered an error at luksFormat on a loop device:
> 
> device-mapper: reload ioctl failed: Invalid argument
> Failed to setup dm-crypt key mapping for device /dev/loop0.
> Check that kernel supports aes-cbc-essiv:sha256 cipher (check syslog for
> more info).
> 
> So I guesss my RHEL6 doesn't have the proper crypto module installed. This
> is a dump of /proc/crypto:
[....]
> But I am not quite sure which package is missing here.  Is it something
> more general like "yum install aes"?

Is this a self-compiled cryptsetup? If not, the installer 
should install all the modules at least for the defaults
when you install "cryptsetup". They should then be loaded 
on-demand I think, but I have not used a module-kernel in 
a long, long time.

> In general, how do I check if all the required crypto modules are supported
> before running any cryptsetup commands?

Just run it and see whether it complains. 

Arno
-- 
Arno Wagner,     Dr. sc. techn., Dipl. Inform.,    Email: arno at wagner.name
GnuPG: ID: CB5D9718  FP: 12D6 C03B 1B30 33BB 13CF  B774 E35C 5FA1 CB5D 9718
----
One of the painful things about our time is that those who feel certainty
are stupid, and those with any imagination and understanding are filled
with doubt and indecision. -- Bertrand Russell


More information about the dm-crypt mailing list